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{{Era|HCW}} | {{Era|HCW}} | ||
'''Hydra''' is a [[UNSC]] general emergency code. It is almost never used due to its content. The Hydra code word signifies imminent threat from [[Bioweapon|biological weapons]] of mass destruction.<ref name="onyx"> | '''Hydra''' is a [[UNSC]] general emergency code. It is almost never used due to its content. The Hydra code word signifies imminent threat from [[Bioweapon|biological weapons]] of mass destruction.<ref name="onyx">''[[Halo: Ghosts of Onyx]]'', Chapter 21</ref> | ||
==Usage== | |||
In [[2552]], [[Cortana]] declared code Hydra via a [[Forerunner]] [[Superluminal communications|slipspace carrier wave]] after the discovery of [[Installation 05]] and its escaped [[Flood]]. The threat came from both the potential for the Halo's activation and the loose Flood that posed a significant threat to all life.<ref name="onyx"/> | In [[2552]], [[Cortana]] declared code Hydra via a [[Forerunner]] [[Superluminal communications|slipspace carrier wave]] after the discovery of [[Installation 05]] and its escaped [[Flood]]. The threat came from both the potential for the Halo's activation and the loose Flood that posed a significant threat to all life.<ref name="onyx"/> | ||
In [[2553]], cryo-jars risked turning into a "Code Hydra problem".<ref> | In [[2553]], cryo-jars risked turning into a "Code Hydra problem".<ref>''[[Halo: Retribution]]'', Chapter 18</ref> | ||
==List of appearances== | ==List of appearances== |